Astral Communions would detrimental to Aviana, since you go straight to the topdeck war.

That being said: Astral communion is an awesome card. Very interesting design-wise, with the possibility to be played in a new style of ramp-druid. I totally love this card. I do not think it is overpowered.

Turn 4? Turn 2 with innervate in hand, Turn 3 with a wild growth, Turn one with coin innervate or innervate, innervate.

The thing is from here how do you build? It’s risky as you draw one large target to watch BGH kill it and your opponent flood you or you attempt fill the deck with cantrips and draws. Neither direction seems reliable off the top of my head but I will test a few lists could be fun in casual play.